Chemical reaction measurements

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Across
  1. 3. reactions / The least reliable method
  2. 5. / Rate measured at certain instant
  3. 6. / The gas too light to be measured in changes in chemical reactions
Down
  1. 1. /Rate of reaction is increase in concentration of ---- or decrease in concentration of reactants per unit time
  2. 2. syringe / Measures the volume of gas
  3. 4. / Device measuring the absorbance of light